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diff -r -U1 sympy-0.7.6.1.orig/sympy/functions/special/zeta_functions.py sympy-0.7.6.1/sympy/functions/special/zeta_functions.py
--- sympy-0.7.6.1.orig/sympy/functions/special/zeta_functions.py 2015-09-04 02:34:00.000000000 +0600
+++ sympy-0.7.6.1/sympy/functions/special/zeta_functions.py 2015-12-01 11:27:24.000000000 +0600
@@ -243,3 +243,3 @@
>>> polylog(s, -1)
- dirichlet_eta(s)
+ -dirichlet_eta(s)
@@ -270,2 +270,3 @@
def eval(cls, s, z):
+ from sympy import unpolarify
if z == 1:
@@ -273,6 +274,12 @@
elif z == -1:
- return dirichlet_eta(s)
+ return -dirichlet_eta(s)
elif z == 0:
- return 0
+ return S.Zero
+ # branch handling
+ if (1 - abs(z)).is_nonnegative:
+ newz = unpolarify(z)
+ if newz != z:
+ return cls(s, newz)
+
def fdiff(self, argindex=1):
@@ -479,3 +486,3 @@
- .. math:: \eta(s) = \sum_{n=1}^\infty \frac{(-1)^n}{n^s}.
+ .. math:: \eta(s) = \sum_{n=1}^\infty \frac{(-1)^{n-1}}{n^s}.
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